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collections
1,843
texts
112
movies
47
images
22
audio
1
concerts
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Topics & Subjects
1,308
HELICOPTERS
1,095
NASA Technical Reports Server (NTRS)
523
DTIC Archive
305
*HELICOPTERS
243
ROTARY WINGS
134
MATHEMATICAL MODELS
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Collection
1,095
NASA Network Resource and Training Site
523
Defense Technical Information Archive
141
NASA Technical Documents
50
Additional Collections - Video
49
The Aerial Surveillance Archive
45
NASA Images
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Creator
1,095
nasa technical reports server (ntrs)
523
defense technical information center
50
federal bureau of investigation
44
nasa/langley research center
24
non
9
worldwide pucks production
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Language
1,882
English
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